Program aims to educate young consumers about mined stones’ positive qualities.
World’s largest fancy-vivid-orangy-pink diamond sells for $8.8 million.
Largest fancy-vivid-orangy-pink diamond in the world will go on sale December 5.
Piece will carry $3 million estimate at December 9 auction.
Pair more than triples high presale price to sell for $370,096.
Decision followed discussions with consignor, company says.
Piece sells for $271,900, beating its $251,900 high estimate.
Top lot — a 4.50-carat fancy-blue diamond — brings in $6 million, within estimates.
Kindred Lubeck, founder of jewelry brand Artifex, makes auction debut.
Ring to lead November 14 Geneva sale, with an upper estimate of $247,868.
Milan auction rakes in $7 million.